What is cos(x-pi/5) ?

The solution to cos(x-pi/5) is ((sqrt(5)+1)cos(x)+sqrt(2)sqrt(5-\sqrt{5)}sin(x))/4

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simplify cos(x-pi/5)

simplify

cos (x - \frac{π}{5})

\frac{( 5 + 1 ) cos ( x ) + 2 5 - 5 sin ( x )}{4}

Solution steps

cos (x - \frac{π}{5})

Rewrite using trig identities

= \frac{( 5 + 1 ) cos ( x ) + 2 5 - 5 sin ( x )}{4}

tan (t + π)

cos (- 5 t)

sec (\cdot arcsec (x))

sin (2 x) - 3 sin (- 5) + 1

sin (arctan (\frac{x}{7}))

What is cos(x-pi/5) ?
The solution to cos(x-pi/5) is ((sqrt(5)+1)cos(x)+sqrt(2)sqrt(5-\sqrt{5)}sin(x))/4